Nucleation of Pearlite in Grey Cast Iron

机译：灰铸铁中珠光体的形核

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This paper is a part of a comprehensive study on the combined effect of the residual elements tin, copper and chromium on the structure and properties of grey iron castings. In this part, special emphasis is put on the potential mechanism of the influence of tin on pearlite promotion. The onset of austenite transformation on cooling to pearlite was investigated by the quenching of chilled samples often different times from solidification. The start of pearlite formation was detected as discrete colonies of pearlite in a martensitic matrix. Extensive use of SME, EDX and electron-microprobe analysis suggests that pearlite may be nucleated from austenite by one of the following mechanisms: I) Segregation of tin together with copper atoms at the austenite/graphite interface leads to the formation of a C-diffusion barrier from austenite to graphite flakes during cooling from the eutectic to eutectoid temperatures. A layer of increased C-content will thus be formed at the interface, which may represent favorable sites for pearlitic carbides nucleation on the surface instabilities of graphite flakes. Ii) Tin is segregated as well to the ternary austenite-phosphide-carbide eutectic formed in the latest stages of solidification forming Fe Fe3(C,Sn) type carbides, which may offer suitable sizes for nucleation of pearlitic carbide lamella.

机译：本文是对残留元素锡，铜和铬对灰铸铁组织和性能的综合影响的综合研究的一部分。在这一部分中，重点特别放在锡对珠光体促进作用的潜在机制上。通过冷却样品的淬火（通常与凝固时间不同），研究了冷却到珠光体时奥氏体转变的开始时间。珠光体形成的开始被检测为马氏体基质中珠光体的离散集落。广泛使用SME，EDX和电子探针分析表明，珠光体可能通过以下机制之一从奥氏体中形核：I）锡与铜原子在奥氏体/石墨界面处的偏析导致C扩散的形成从共晶温度到共析温度的冷却过程中，从奥氏体到石墨薄片的屏障。因此，将在界面处形成一层C含量增加的层，这可能代表珠光体碳化物在石墨鳞片的表面不稳定性上成核的有利位置。 i）锡也与在凝固形成Fe Fe3（C，Sn）型碳化物的最新凝固阶段形成的三元奥氏体-磷化物-碳化物低共熔物分离，这可能会为珠光体碳化物薄片的成核提供合适的尺寸。

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《》|2006年|P.1-6|共6页
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A. A. Nofal; M. M. Mourad;
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中图分类铸铁;
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Nucleation; Grey Cast Iron; Segregation; Phosphide Eutectic;

机译：成核;灰铸铁;偏析;磷共晶;

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1. Study of Etchants in the Measurement of Ferrite-Pearlite Proportion in Grey Cast Iron Samples [J] . Rovi Sehgal Indian Foundry Journal . 2014,第7期

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2. INFLUENCE OF THE MICROSTRUCTURE ON MACHINING A CENTRAL HOUSING MADE OF PEARLITE GREY CAST IRON [J] . Neva Strekelj, Milanka Nunic, Iztok Naglic Materiali in Tehnologije . 2013,第2期

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3. Inoculation of cast iron melts. Part 1. influencing of the nucleation for the graphite precipitaion and degree of oxidation of non-inoculated and inoculated grey iron [J] . E. Fras, C. Podrzucki, H. F. Lopez Giessereiforschung . 1998,第2期

机译：接种铸铁熔体。第1部分。成核对石墨沉淀的影响以及未接种和接种的灰铁的氧化程度
4. Nucleation of Pearlite in Grey Cast Iron [C] . A. A. Nofal, M. M. Mourad International Symposium on Science and Processing of Cast Iron; 20061016-19; Beijing(CN) . 2006

机译：灰铸铁中珠光体的形核
5. Characterization of tribological behaviour of graphitic aluminum matrix composites, grey cast iron, and aluminum silicon alloys. [D] . Riahi, Ahmad Reza. 2002

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6. Auto-analysis system for graphite morphology of grey cast iron [O] . Hong Jiang, Yiyong Tan, Junfeng Lei, 1988

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7. A Fundamental Study on Nodular Graphite Cast Iron. (III) : The Influence of the Chemical Compositions on the Graphitization Time of Pearlite in the As-cast Structures of Nodular Graphite Cast Iron [O] . Morita Shiro, Shimokawa Keiji 1952

机译：球墨铸铁的基础研究。（III）：球墨铸铁铸态组织中化学成分对珠光体石墨化时间的影响

Nucleation of Pearlite in Grey Cast Iron

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